Don't stand too close
Pick one of the isotopes of nickel from https://en.wikipedia.org/wiki/Isotopes_of_nickel an note its mass. eg ⁵⁸Ni: 57.9353429 amu. Add the mass of a hydrogen atom (1.007825 amu) and subtract the mass of the corresponding copper isotope (See https://en.wikipedia.org/wiki/Isotopes_of_copper) ⁵⁹Cu: 58.9394980 amu. For this example the result is +0.00367 amu, so the reaction releases energy. Convert to MeV by multiplying by 931.494061 (3.4Mev) so the energy comes out as a gamma ray.
If we walk past the magic required to get nickel to absorb protons at a useful rate (1.8x10¹² reactions per second per Watt), we still need another spell to convert the gamma rays to electricity with 100% conversion efficiency. Consider some of the consequences of failure. Pretend to device is only 99% efficient at absorbing gamma rays. That still leaves 150kJ/second. If you stand 100metres away, you get a very lethal dose of radiation every second. (A 1cm thick lead shield drops the gamma ray intensity by 50%, so a useless 99% shield is equivalent to 6.5cm of lead surrounding the reactor). The other problem is generating electricity. The usual way to do this in bulk is that the radiation heats a liquid that drives a turbine that spins a generator. If you get 1.5MW of electricity out like that, you also have to have to get rid of 3MW of heat. Again lets use magic to get 99% conversion efficiency. That still leaves 15kW of heat. I did not see any fans on that container, so park it somewhere cool.
Alternatively, as no-one has died from radiation poisoning, you can safely assume this E-Cat does not use a nuclear reaction.